>>The A-frame is as low as it goes with out taking it apart.No we havent gotten her hips Xrayed but now that you mentjion it we will set up the earliest appoibntment possible to find out.I dont think it is that because she will do the dog walk just fine.We will still have the xrays done.Well Ill post you back and tell you how she is doing.
Speaking from experience. . .let the "A-Frame" go for now. Just ignore the whole thing for now and act like it doesn't even exist. The reason I'm saying this is because my dog Carson had a horrible experience with the dog-walk. He fell off it and would not even go near it! So, I would have him concentrate on the other obsticles and I made the whole experience of agility fun. Now, I can honestly say that the dog-walk is his favorite thing to do! How I finally coaxed him onto it was "treats, treats, treats!" If he even turned his head in the direction of the dog-walk I gave him a treat, if he put one paw on the dog-wald, I gave him a treat. . .you get the point. Try not to focus on the A-frame for now, your GSD will figure it out if you make it fun. Good luck!
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Charlene 
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Adopt the pace of Nature
Her secret is patience
-Ralph Waldo Emerson-